The Duchess

When The Duchess enters play, create a colorless
Treasure artifact token with "{t}, Sacrifice this
artifact: Add one mana of any color." and
Investigate. (Create a colorless Clue artifact token
with "{2}, Sacrifice this artifact: Draw a card.")
{2}{u}{u}: Return the The Duchess to your hand.
"The old Madam always knew a few tricks, as
well as secrets and coin. But word is she has
a real tutor now.